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Modeling Phase-resolved Observations of the Surfaces of Magnetic Neutron Stars
Wynn C. G. Ho, Kaya Mori
Recent observations by XMM-Newton detected rotational pulsations in the total brightness and spectrum of several neutron stars. To properly interpret the data, accurate modeling of…
Modelling mid-Z element atmospheres for strongly-magnetized neutron stars
Kaya Mori, Wynn C. G. Ho
We construct models for strongly-magnetized neutron star atmospheres composed of mid-Z elements (carbon, oxygen and neon) with magnetic fields B=10^{12}-10^{13} G and effective tem…
Ionization and dissociation equilibrium in strongly-magnetized helium atmosphere
Kaya Mori, Jeremy S. Heyl
Recent observations and theoretical investigations of neutron stars indicate that their atmospheres consist not of hydrogen or iron but possibly other elements such as helium. We c…
Accelerator Testing of the General Antiparticle Spectrometer, a Novel Approach to Indirect Dark Matter Detection
C J Hailey, T Aramaki, W W Craig +7
We report on recent accelerator testing of a prototype general antiparticle spectrometer (GAPS). GAPS is a novel approach for indirect dark matter searches that exploits the antide…
Detailed spectral analysis of the 260 ksec XMM-Newton data of 1E1207.4-5209 and significance of a 2.1 keV absorption feature
Kaya Mori, James C. Chonko, Charles J. Hailey
We have reanalyzed the 260 ksec XMM-Newton observation of 1E1207.4-5209. There are several significant improvements over previous work. Firstly, a much broader range of physically…
Development of the Gaseous Antiparticle Spectrometer for Space-based Antimatter Detection
C. J. Hailey, W. W. Craig, F. A. Harrison +5
We report progress in developing a novel antimatter detection scheme. The gaseous antiparticle spectrometer (GAPS) identifies antimatter through the characteristic X-rays emitted b…
Isolated magnetar spin-down, soft X-ray emission and RXJ1856.5-3754
Kaya Mori, Malvin A. Ruderman
When an isolated magnetar with magnetic dipole field B ~ 10^15 G moves at high velocity (v > 10^7 cm/s) through the ISM, its transition into propeller effect driven spin-down may o…
XMM-Newton observations of the Vela pulsar
Kaya Mori, Charles J. Hailey, Frits Paerels +1
We present spectral analysis from XMM-Newton observations of the Vela pulsar. We analyzed thermal emission from the pulsar dominating below ~ 1 keV since extracted spectra are heav…
Detailed atmosphere modelling for the neutron star 1E1207.4-5209: Evidence of Oxygen/Neon atmosphere
Kaya Mori, Charles J. Hailey
We present a comprehensive investigation of the two broad absorption features observed in the X-ray spectrum of the neutron star 1E1207.4-5209 based on a recent analysis of the 260…
Detection of an Iron Emission Feature from the Lensed BAL QSO H1413+117 at z=2.56
T. Oshima, K. Mitsuda, R. Fujimoto +8
We present the X-ray energy spectrum of the lensed BAL QSO H1413+117 (the Cloverleaf) at z=2.56 observed with the Chandra X-ray observatory. We detected 293 photons in a 40 ks Adva…